Code (sketch) for an arduino uno microcontroller that will be connected to an MT8870 decoder chip. This chip decodes the signal it receives from a phone mic as a dtmf (dual tone multiple frequency) signal. Then the decoder chip translates the tones into digits pressed on the phone. These four signals will be sent in as analog inputs and I need code that I can download on to the microcontroller to take these digits and control a dc motor with pwm that is built in to the arduino uno. For example when I press 1 it turns on at low speed. 2-3-4-5 etc higher speed. And when at higher speed press 5-4-3-2 and it slows down. Also, I would like it to turn of when pressing zero. Please comment all code and explain functionality. I'll rate alot of points for this implementation!!!! It has to work on Arduino uno.